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A000168
2*3^n*(2*n)!/(n!*(n+2)!).
(Formerly M1940 N0768)
+0
4
1, 2, 9, 54, 378, 2916, 24057, 208494, 1876446, 17399772, 165297834, 1602117468, 15792300756, 157923007560, 1598970451545, 16365932856990, 169114639522230, 1762352559231660, 18504701871932430, 195621134074714260
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Maintained by
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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.
AT&T Labs Research
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